Skiving-machine.



E. E. LANE.

sKlvlNG MACHINE. APPLICATION FILED DECJT. I9I5.

Patented Aug. 7, 1917.

ELMER E. LANE, 0F BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHIN- ERY COMPANY, 0F PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SKIVINGr-IVIACHINE.

Specification of Letters Patent.

Patented A110. 7, 1917.

Application led December 1*?, 1915. Serial No. 67,418.

To all fwwm t may concer/n Be it known that I, ELMER E. LANE, a citizen of the United States, residing at Beverly, in the county of Essex and State of Wassachusetts, have invented certain new and useful Improvements in Skiving-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to Vwhich it appertains to make and use the same.

This invention relates to skiving machines, and more particularly to that class of skiving machines which are provided with a die cavity in which the blank is held during the skiving operation.

Skiving machines of the type illustrated in the patent to Scott, No. 969,987, patented September 13, 1910, give satisfactory results in skiving most of the different grades and characters of stock used in the manufacture of shoes. However, when skiving leather board, fiber board, or similar material, which consists of a board built up of a series of layers, the pressure roll usually employed in this type of machine does not properly hold the blank to get a good skiving, since the knife has a tendency to enter between the layers of material and tear them apart.

The primary object of the present invention is to provide a pressure device for blank skiving machines which will effectively hold a blank cf leather board or similar material in a die cavity in a position so that the skiving devices will make a perfect cut.

In accordance with this obj ect, one feature of the invention contemplates the provision in a skiving machine having a die cavity in which the blank is held by a pressure device during the skiving operation, of V,means for placing an additional pressure on the blank opposite the cutter when a predetermined portion of the blank is being skived.

It hasv been found in practice 'in skiving fiber board that the skiving knife when cutting across the grain has a tendency to tear open the top layers only of the board as it is finishing this portion of its cut. For this reason the additional pressure is preferably placed on the leading edge of the blank at aV point opposite where the knife nishes its cut.

rlhe preferred form of the invention is illustrated as embodied in a cavity roll skiving machine having a disk feed roll. 'The pressure device is shown as a series of pressing surfaces on the feed roll which coperates with the feed disks of the roll to hold the blank in the cavity and give a rigid bearing for the skiving knife to cut against. Accordingly, another feature of the invention contemplates the provision in a disk feed roll for blank skiving machines of a series of pressure plates interposed between the feed disks for directly pressing against the blank. The pressure plates are held from rotation with the feed roll but are movable into and out of pressure relation with the cavity roll to facilitate the feeding of blanks. Since the faces of the pressure plates extend radially beyond the teeth of the feed disks, the plates act as strippers to clear the disks of waste.

Other features of the invention consist of certain devices, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in .the art from the following description.

The several features of the invention are 'illustrated in the accompanying drawings, in which Figure 1 is a longitudinal sectional view of a cavity roll skiving machine embodying the preferred form of the invention; Fig. 2 is an enlarged detail view in vertical section showing the pressure device; and Fig. 3 is a. detail plan view of the pressure device.

The skiving machine illustrated in the drawings is substantially the same in construction, arrangement and mode of operation of its 'various parts as the machine disclosed in the patent hereinbefore referred to. This machine is provided with a positively driven cavity roll 10 and a pressure or feed roll lwhich coperate to feed the blanks against a stationary skiving knife 14. The blanks are stacked in a magazine 16 and are fed forward to the bite of the feedl and cavity rolls one at a time by means of a recipropressure roll l2 acts to force the blanks into a cavity 22 of the roll 10 so that they are properly positioned when they are moved against the edge of the skiving knife 14.

CIS

Vhen cutting blanks, however, which are made up of layers of material cemented and compressed together, the knife tends to enter between the layers, especially the top layers where the knife finishes its cut at the leading edge of the blank, and the feed roll does not support the blank rigidly enough to obtain a good skiving.l To properly support the blanks so that a perfect skiving may be obtained, a series of pressure piates are placed on the feed roll, which form a rigid pressure bearing on the blank for the knife to out against when finishing its cut at the leading edge of the blank.

The feed roll 12 consists of a series of toothed disks 24 (Figs. 2 and 3), which are keyed on a shaft 26 and spaced apart by means of a series of'washer's 28 which are also keyed to the shaft. rlhe pressure plates 30 are loosely mounted on the 'washers 28, and each plate is provided with a 'pressure abutment 32 which extends radially beyond the'teeth of the pressure disk. The abutments on the pressure plates exert 'a greater pressure on the blank than the te'eth'of the feeding disks 24, and while they arel pressing on'the blank they move with the blank and help to feed it. To facilitate the'feeding of the blanks and allow them toy be'properly positioned in the cavity, the abutments aremoved to the position illustrated inFig. 2, forconvenience'termed the feeding position. When in thisposition the pressureA abutments 32 are out of the path offmovement of the blank, and the Vblank may be fed forward into asubstanti'al bite of the feed rolls before the abutments arel brought into pressure position upon' the blank. As

the blank Yis advanced to the feed rolls byl the fee'd slide 18,' it first comes in contact' with a feed tooth 34 on the pressure plates, and the movement of the blank rotates the plates around the shaft and brings the abutments 32 vinto contact with the blank. When' the knife is skiving the first or front portion of the blank, it cuts against the grain of a iiber board blank, and the top layers of the blank, especially, are'liable to be' torn apart as the knife finishes itsY cut. To prevent the' layers of the material from being torn apart, the abutments 32V move with the 'blank and reach'their full pressure position upon the blank when they are immediately in front of and opposite thecutting edge of the knife, or at thel position in which the 'knife'iinishes its cut. As

the feeding Emovement 'of the blank Vvcontinues, 7the knife emerges 'from the blankl andv the feed teeth 34 and pressure abutments 32 move around the shaft and stop in'y plates, or by the contact of stops 38 on the plates with lstationary lingers 40 supported above the feed roll. The stationary' iingers 40 for stopping the pressure plates are formed on an angle iron 42 which is attached to the machine frame. The fingers project down between the feeding disks 24 into the path of the stops 38.

While the knife is skiving the rear half of the blank, it cuts with the grain of the blank and there is no tendency to tear the fibers. -For this reason the pressure plates are arrc nged to contact with the blank only when the knife is cutting against the grain of the blank, and move out of operative positionon the blank while the knife is skiving the portion of the blank in which it cuts with the grain. The distance between the feed tooth 34 andthe abutment 32 in the illustrated embodimentof the invention is arranged to be the length of the bevel or scarf, so that the pressure abutments 32 will exert theirgreatest pressure only at the time the knife is finishing its cut. However, if the layers of the board show a separate before the knife nnishes its cut, or if the scarf is long, the abutment 32 could be elongated, and, in fact, extended fromV the tooth 34 which engages the endy of the blank back to the point where the cut iinishes. The high pressure placed upon the blank by the abutment 32 makes `it desirable tomove vthe abutment with the blank during the feed, because any dragV of the abutment on' the blank would tend to hinder the feed on theblankand displaceit in the cavity.

Y After the blank has been skived, the 'piressure plates are moved back to the feeding position illustrated in Figsl l and 2 by the springs l36 preparatory lto skivingithe next blank.' The ends of the springs 36 bear against aV shoulde'r44 on vthe pressure plates and actto rotate the plates to' thel feeding position,'which is determined by afeed stop 46 on the plates 'coming in contact with theV stationary fingersl 38. i These springs 36 are clamped between two washers V48'on a rod 50 which is supported between justable brackets 52 frame. The rod 50 has a head V54 at one endand a nut andthread 56 at its oppositer end. AThe springs are positioned longitudi nall y on the rod "by" means of a series of positioning washers 58V and are clamped in position by the nut 56.' To varythe pres- V sure 'of the springs upon the Vpressure'plates, the rod 50 may be rotated by means of a pair of setv screws 60 which into one of the brackets 52.

While the pressure device illustrated in the-drawings employs twelveV pressure plates,

.it is to be understood that the number` of' platesemployed 'depends on the size of the blank being skived. The pressure plates areVv distributediacross the feed.V roll so that they tendency toV Y a pair'of adsecured to the machine are' threaded will extend across the space occupied'by the cavity of the die roll.

The invention has been illustrated and described as applied to a particular type of skiving machine, but it is not so limited in its application, since it may be used in connection with any of the machines for treating blanks which employ a cavity roll. Further, the cavity or matrix for positioning the blank need not be on a cavity roll, but may be on a member which would be moved relativelyI to the skiving knife to feed the blank past the skiving knife.

Having thus indicated the nature and scope of my invention, and having specifically described a preferred embodiment thereof, What I claim as nevv is 1. A machine for skiving blanks, having, in combination, a skiving cutter, a cavity roll, a feeding pressure roll, and means on the pressure roll movable into position for placing additional pressure on a blank opposite the cutter When a predetermined portion of the blank is being skived.

2. A machine for skiving blanks, having, in combination, a skiving cutter, a cavity roll, a feeding roll arranged to press blanks into the cavity, and an auxiliary pressure device for exerting pressure on the blanks only during a predetermined part of the skiving operation.

3. A machine for skiving fiber board blanks, having, in combination, a skiving cutter, a cavity member for positioning a blank vvhile it is being skived, means for holding the blank in the cavity, means for relatively moving thecavity member and cutter to skive the blank, and a pressure device for exerting a rigid pressure on the blank while the cutter is cutting against the grain of the fiber board.

A machine for skiving fiber board or similar blanks, having, in combination, a stationary skiving cutter, a cavity roll, means for feeding and pressing a blank into the cavity, and means for placing additional pressure on the blan-k only at the portion Where the cutter finishes its skiving operation against the grain of the fiber board.

5. A machine for skiving fiber board blanks, having, in combination, a stationary skiving knife, a cavity roll, a feed roll for pressing blanks into the cavity of the cavity roll, and pressure plates on said feed roll having pressure abutments movable with the blank to place additional pressure on the blank at the point Where the skiving knife finishes its cut against the grain of the `liber board.

6. A machine for skiving blanks, having, in combination, rolls for feeding blanks including a cavity roll, a skiving knife, a pressure device for pressing blanks into the cavity of the cavity roll, means for normally holding said device out of a pressure position, and means controlled by the movement of blanks to advance the device to a pressure position for the skiving operation.

7. A machine for skiving blanks, having, in combination, a cavity roll and a disk roll for feeding blanks, a knife for skiving blanks, means for advancing blanks to said rolls, a series of pressure plates movably mounted on the shaft of the disk roll, feeding teeth on said plates for contacting the blanks, pressure surfaces on said plates for forcing the blanks into the cavity, and stops on said plates for engaging an abutment to stop the plates in a feeding position and for stopping the movement of the plates after they are movedv out of pressure relation to the blanks.

S. A machine for skiving fiber board orV similar blanks, having, in combination, a cavity roll and a disk roll for feeding blanks, a cutter for skiving blanks, pressure plates on the disk roll shaft having abutments to form a rigid bearing for the blanks While being cut, and means to place the abutments immediately opposite the cutting edge of the cutter when the cutter is finishing its cut against the grain of the fiber board.

9. A pressure device for blank skiving machines, having, in combination, a shaft, a series of pressure and feeding disks on said shaft, and a series of pressure plates mounted on said shaft and interposed between the disks.

10. A pressure device for blank skiving machines, having, in combination, a shaft, a series of pressure and feeding disks on said shaft, a series of pressure plates movably mounted on said shaft and interposed between the disks, and stops on the plates to limit their movement.

11. A pressure device for blank skiving machines, having, in combination, a shaft, a series of feeding disks on said shaft, aseries of Aplates movably mounted on said shaft and interposed between the disks, means for controlling the movement of the plates, and stripping surfaces on said plates to clear the disks of the skiving Waste.

12. A pressure device for blank skiving machines, having, in combination, a feed roll comprising a series of feeding disks on a shaft, a series of pressure plates movably mounted on said shaft having pressure abutments, and means cooperating With said plates to control their movement.

13. A pressure device for blank skiving machines, having, in combination, a feed roll comprising a series of feeding disks on a shaft, a series of pressure plates movably mounted on said shaft having pressure surfaces, feeding teeth on said plates, and means to normally hold said teeth in the path of movement of the blanks.

14. A pressure device for blank skiving machines', having,l in combination, a feed roll comprising a series of feeding disks on a shaft, av series of pressure plates movably mounted on said shaft having pressure surfaces", feeding teeth on said plates, a series o'f springs engaging the plates to normally hold the teeth in the path of movement of a blank, and vfingers proj ecting into the path of movement of the plates to stop' a rotation of' the plates when the teeth have been moved out of the path of a blank.

' 15.'- A pressureV device for 'blank skiving machines, having, in combination, a shaft, a seriesof feedingy disks fixed on said shaft, a series' of plates -movablly I'nointed on ysaid shaft, apres'slire' abutment onV each' plate, a Y

ELMER E. LANE.

Copies of this patent may be obtained for five cents each," by acdressir tfi'emnimiissioniei df falten'ts. Washington, D. C. 

